NewerTech said that the upgrades have been tested and are compatible with the AGP Graphics/Sawtooth, Gigabit Ethernet, Digital/Audio, and Quicksilver model PowerMac G4 computers and are verified for compatibility with Mac OS X 10.5, "Leopard."

MaxPower Freesscale G4/7448

Introduced in March 2007 as the worldis first available and shipping G4 7448
processor upgrade, the MAXPower Processor Upgrade gives PowerMac G4 owners
with less than the Leopard-required 867 MHz processor speed the hardware
support needed to run Leopard. Additionally, by adding a MAXPower Processor
Upgrade, PowerMac G4 owners can experience better performance from existing
applications, as well as the ability to run new processor demanding
applications, according to Newertech.

NewerTech also said the latest
generation Freescale 7448 processors and are 100 percent compatible with existing
hardware, application software, and previous and current versions of Mac
operating systems, OS 9.2.2 and OS X 10.3.5 or later with no operating
system modifications needed. The upgrades are user installable in about 10 minutes.